from __future__ import annotations

from sqlalchemy import select

from app.modules.accounting.taxonomy_models import AccountingNature


SALES_INCOME_NATURES = [
    # code, name, parent, group, cap/revenue, posting, sort, description
    ("SALES_INCOME", "Sales & Income", None, "income", "revenue", False, 1100, "Sales and income classification root."),
    ("TRADING_SALES", "Trading / Stock Sales", "SALES_INCOME", "income", "revenue", True, 1110, "Sale of goods principally held for resale."),
    ("MANUFACTURED_GOODS_SALES", "Manufactured Goods Sales", "SALES_INCOME", "income", "revenue", True, 1120, "Sale of goods manufactured or produced by the entity."),
    ("SERVICE_INCOME", "Service / Professional Income", "SALES_INCOME", "income", "revenue", True, 1130, "Revenue from services, professional work or contractual services."),
    ("EXPORT_SALES", "Export Sales / Services", "SALES_INCOME", "income", "revenue", True, 1140, "Export of goods or services."),
    ("EXEMPT_NIL_SALES", "Exempt / Nil-Rated Sales", "SALES_INCOME", "income", "revenue", True, 1150, "Sales or supplies treated as exempt or nil-rated."),
    ("SCRAP_SALES", "Scrap / Waste Sales", "SALES_INCOME", "income", "revenue", True, 1160, "Sale of scrap, waste or residual materials."),
    ("JOB_WORK_INCOME", "Job Work / Processing Income", "SALES_INCOME", "income", "revenue", True, 1170, "Income from job work, processing or conversion activity."),
    ("COMMISSION_INCOME", "Commission / Brokerage Income", "SALES_INCOME", "income", "revenue", True, 1180, "Commission, brokerage or intermediary income."),
    ("RENTAL_INCOME", "Rental / Hire Income", "SALES_INCOME", "income", "revenue", True, 1190, "Business rental, lease or hire income."),
    ("INTEREST_INCOME", "Interest Income", "SALES_INCOME", "income", "revenue", True, 1200, "Interest earned and accounted as income."),
    ("OTHER_OPERATING_INCOME", "Other Operating Income", "SALES_INCOME", "income", "revenue", True, 1210, "Other income arising from normal operations."),
    ("OTHER_INCOME", "Other Income", "SALES_INCOME", "income", "revenue", True, 1220, "Non-operating income not represented by a more specific nature."),
    ("ASSET_SALE", "Sale of Capital Asset", "SALES_INCOME", "income", "capital", True, 1230, "Disposal proceeds relating to capital assets; reviewer must determine final accounting treatment."),
    ("SALES_REVIEW_REQUIRED", "Sales / Income Review Required", "SALES_INCOME", "income", "review", True, 1290, "Fallback for outward transactions with insufficient evidence."),
]


def ensure_sales_income_taxonomy(db, tenant_id: int, actor_user_id: int | None = None) -> int:
    existing = set(
        db.execute(
            select(AccountingNature.code).where(AccountingNature.tenant_id == int(tenant_id))
        ).scalars().all()
    )
    inserted = 0
    for code, name, parent_code, group, cap_rev, posting, sort_order, description in SALES_INCOME_NATURES:
        if code in existing:
            continue
        db.add(
            AccountingNature(
                tenant_id=int(tenant_id),
                code=code,
                name=name,
                parent_code=parent_code,
                classification_group=group,
                capital_revenue=cap_rev,
                description=description,
                sort_order=sort_order,
                is_posting_nature=bool(posting),
                is_active=True,
                is_system_defined=True,
                created_by_user_id=actor_user_id,
                updated_by_user_id=actor_user_id,
            )
        )
        inserted += 1
    if inserted:
        db.commit()
    return inserted


def sales_income_natures(db, tenant_id: int):
    ensure_sales_income_taxonomy(db, tenant_id)
    return list(
        db.execute(
            select(AccountingNature).where(
                AccountingNature.tenant_id == int(tenant_id),
                AccountingNature.classification_group == "income",
                AccountingNature.is_posting_nature.is_(True),
                AccountingNature.is_active.is_(True),
            ).order_by(AccountingNature.sort_order, AccountingNature.name)
        ).scalars().all()
    )